Originally Posted by MarkN

This only affects cars made after March 2001. The CO figures for cars made before that are not available in many cases so they stick with the old system.

The new prices are

Anything up to 1559cc - £120
Anything over 1559cc - £200

I'm not sure when these changes take effect though - it might be next year.

Glad I've not got a Focus ST or RS - the tax must be a fortune on those now.